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Need lower governor speed setting for large scale helis
https://www.spirit-system.com/phpBB3/viewtopic.php?f=20&t=1325		 Page 1 of 1
Author:  rgbsr1 [ Wed 30. Mar 2016 22:09:46 ]
Post subject:  Need lower governor speed setting for large scale helis
Hi.

Is there a way of setting governor RPM lower than 1500. I have several large scale helis that require 1000 to 1400 RPM head speed.
I have used several Spirit gyros in large scale models with great success and I would like to use the governor function.
Regards.
Roger
Author:  jgiannakas [ Wed 30. Mar 2016 22:11:31 ]
Post subject:  Need lower governor speed setting for large scale helis
Halve the sensing divider and double the max headspeed. Or double the gear ratio and double the headspeed :)
Author:  Coco66 [ Wed 30. Mar 2016 22:54:30 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
jgiannakas wrote:
Halve the sensing divider and double the max headspeed. Or double the gear ratio and double the headspeed :)


(do you also wonder why they do not want to fix those minimum and maximum values and they suggest these crazy workarounds?)
Author:  jgiannakas [ Wed 30. Mar 2016 22:57:53 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
Yeah not sure why really.... Maybe some number / code limitation but still
Author:  rgbsr1 [ Wed 30. Mar 2016 23:43:44 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
OK I'll give that a try. I guess the command and the measured values will be (2) twice the real RPM.
Author:  jgiannakas [ Thu 31. Mar 2016 7:24:15 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
Yeap correct
Author:  ZeXx86 [ Thu 31. Mar 2016 7:29:34 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
Hi,

if you need 1000 - 1400 RPM, you can set 1500 as Max Head Speed without any problem.
To achieve 1400 RPM, just set 93,5% TC. To achieve 1000 RPM it should be 67%.

Nothing else needed to change, so all can be configured properly.
Author:  velocity90 [ Thu 31. Mar 2016 8:32:51 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
Slightly off but what is the formula to calulate headspeed % for instance with 3200 max?
Author:  ZeXx86 [ Thu 31. Mar 2016 8:40:19 ]
Post subject:  Re: Need lower governor speed setting for large scale helis
Formula is quite simple: Requested RPM = Max Head Speed * Throttle Curve


Throttle Curve is usually in % so you have to divide value by 100.
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